You have two options with this depending on child size. The most common is through the slots in the back behind the cover then tightened. The other option with larger kids or for quick removal is to strap it over the the lap of the carseat.

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Hi - If it is an infant carrier Group 0+ carseat it must never be installed facing forwards. It is designed as a rear facing carseat to keep your child safe in the event of an accident. Always install a carseat according to the instructions.

Go to the Britax website they have a pretty detailed explaination. Basically use the latch clips put your knee in it and pull tight. where you get the real security is though the tether that comes of the back of the headrest, you attach that to the floor clip in your car or under the front seat if you dont have one.

That is the common installation process for a convertible carseat in rear-facing position. It is important that the shoulder/lap seatbelt be as tight as possible. This can best be achieved by putting as much of your own weight as possible on the carseat (without the baby of course), clicking into the seatbelt fastener and then pulling as much slack as possible out of the seatbelt strap. If you have the assistance of another adult, one should provide the weight on the carseat from inside the vehicle while the other pulls on the seatbelt strap from outside to remove as much slack as possible. If you have an I-shaped locking bracket, it should be installed over both straps 1 inch from the seatbelt fastener.

Some, but not all, manufacturers provide a metal locking bracket to be placed on the seat belt after the carseat is installed to prevent excessive slippage. You could contact your manufacturer to see if one should have been provided or you may purchase one at most major baby product retailers.

Be aware, a little movement of the installed carseat is considered normal and acceptable.

One last note, many fire stations, police stations, children's hospitals and even car dealerships offer free carseat safety checks. Call those in your area and ask if they offer this service.